Pressure rising on vokera linea boiler, to 3bar, and over. then gets dumped enventially out of high press blow off. Is it the diverter valve thats passing, the pressure vessel diaphram, or somthing that im missing? Any ideas would be gratefully recieved.

chris bennett, January 2012

Chris, Hi, From your post, Lets try the cheap stuff first more info required. Does the pressure climb quickly and then vent and once cooled down do you have to re-charge the system? This re-charging may only be required after several periods of boiler firing activity. Linea one of the better combi boilers, so don't dispare yet!

Colin West Yorkshire, January 2012

What is pressure cold? should be about 1 bar. Are all radiators getting hot? Check that fill loop valve not slightly open.
"Is it the diverter valve thats passing, the pressure vessel diaphram" What??

SD, January 2012